LeetCode Delete Duplicate Emails，leetcodeduplicate

LeetCode Delete Duplicate Emails，leetcodeduplicate

Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id.

+----+------------------+
| Id | Email            |
+----+------------------+
| 1  | john@example.com |
| 2  | bob@example.com  |
| 3  | john@example.com |
+----+------------------+
Id is the primary key column for this table.

For example, after running your query, the above Person table should have the following rows:

+----+------------------+
| Id | Email            |
+----+------------------+
| 1  | john@example.com |
| 2  | bob@example.com  |
+----+------------------+

delete from Person where id not in (select max(a.id) as id from Person a group by email);

delete from Person where id not in (select id as id from (select min(b.id) as id from Person b group by email) as a);